Generate Line Graph

[Lea Birm]

Dear all,

I am struggling with my data and would really appreciate your help. My idea is to design a line graph which shows months on the x-axis and # of births on the y-axis of a specific country.

The data is as follows:
country date births
AUT 2012 ..
AUT 2013
AUT 2014
BEL 2012
BEL 2013
BEL 2014

where births is a floating variable, date a floating variable and country a long variable.

When I use the following code, I always get the message "type mismatch r(109)" and I suppose that the mismatch must come from the country variable but I have no clue how to fix it.
Do you have any idea where my mistake is?


[twoway (line births date if country="BEL")]


I really appreciate your help!

[Nick Cox]

Please use dataex to give a data example as explained at https://www.statalist.org/forums/help#stata

if country == "BEL"

would be legal if and only if country were a string variable. A single equals sign is always wrong there. Perhaps country is a numeric variable with value labels. A data example would make this clear to us.